ABSTRACT
Extraction of neem seed oil was carried out using solvent extraction (n-hexane). 200g of neem seed yield 40ml of oil which is 80% yield. The neem oil is dark brown in colour, it has a strong odour that is said to combine the odours of palm kernel and garlic. The extraction of neem seed oil occurred in batches using solvent (n-hexane) also soxhlet extractor was used. The sample was ground and 200g was weighed out and soaked with 1000ml of n-hexane for 24 hours. With the help of butchner funnel and the vacuum pump, the solvent (n-hexane and neem seed oil) was filtered off from the sample leaving the residual in the buchner funnel. As the solvent was being heated, it vapourized and passed through the condenser and then condensed and trickled down on the thimble containing the neem seed. The reaction occurred in the thimble. The n-hexane now extracts the essential oil in the sample and also other impurities like resins and waxes. When the liquid level filled the body of the extraction, it was then automatically siphoned back to the flask. This extract took about three hours for complete extraction. At the end, the set was dismantled and the sample changed. At the end of the extraction using 200g of neem seed and 100ml of n-hexant, 40m of neen seed oil was obtained.
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